Add helper function to check if the Realm Management
Extension (RME) is implemented by the hardware.
Cc: Ard Biesheuvel <ardb+tianoc...@kernel.org>
Cc: Leif Lindholm <quic_llind...@quicinc.com>
Signed-off-by: Sami Mujawar <sami.muja...@arm.com>
---
ArmPkg/Include/Chipset/AArch64.h | 3 ++-
ArmPkg/Include/Library/ArmLib.h | 15 ++++++++++++++-
ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c | 16 +++++++++++++++-
3 files changed, 31 insertions(+), 3 deletions(-)
diff --git a/ArmPkg/Include/Chipset/AArch64.h b/ArmPkg/Include/Chipset/AArch64.h
index
5390bf0a2774fb410f33e031cb0367708905c658..33f8df12637b7003b46458ae0680f67ebc3a431a
100644
--- a/ArmPkg/Include/Chipset/AArch64.h
+++ b/ArmPkg/Include/Chipset/AArch64.h
@@ -1,7 +1,7 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
- Copyright (c) 2011 - 2021, Arm Limited. All rights reserved.<BR>
+ Copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -30,6 +30,7 @@
// ID_AA64PFR0 - AArch64 Processor Feature Register 0 definitions
#define AARCH64_PFR0_FP (0xF << 16)
#define AARCH64_PFR0_GIC (0xF << 24)
+#define AARCH64_PFR0_RME (0xFULL << 52)
// ID_AA64DFR0 - AArch64 Debug Feature Register 0 definitions
#define AARCH64_DFR0_TRACEVER (0xFULL << 4)
diff --git a/ArmPkg/Include/Library/ArmLib.h b/ArmPkg/Include/Library/ArmLib.h
index
6aa8a48f07f39255b70406774d2d803dbfc97b0b..ed876d231bbe82a1655e7455d04c92042aab3a94
100644
--- a/ArmPkg/Include/Library/ArmLib.h
+++ b/ArmPkg/Include/Library/ArmLib.h
@@ -1,7 +1,7 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
- Copyright (c) 2011 - 2016, ARM Ltd. All rights reserved.<BR>
+ Copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
Copyright (c) 2020 - 2021, NUVIA Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -824,6 +824,19 @@ ArmHasSecurityExtensions (
VOID
);
+#else
+
+/** Checks if RME is implemented.
+
+ @retval TRUE RME is implemented.
+ @retval FALSE RME is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasRme (
+ VOID
+ );
+
#endif // MDE_CPU_ARM
#endif // ARM_LIB_H_
diff --git a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
index
87285465871dc100ea0065659959ca845912c549..8952524fb3d56695cce181f852723d8b2a1dc77c
100644
--- a/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
+++ b/ArmPkg/Library/ArmLib/AArch64/AArch64Lib.c
@@ -1,7 +1,7 @@
/** @file
Copyright (c) 2008 - 2009, Apple Inc. All rights reserved.<BR>
- Portions copyright (c) 2011 - 2014, ARM Ltd. All rights reserved.<BR>
+ Portions copyright (c) 2011 - 2023, Arm Limited. All rights reserved.<BR>
Copyright (c) 2021, NUVIA Inc. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
@@ -150,3 +150,17 @@ ArmHasEte (
// The ID_AA64DFR0_EL1.TraceVer field identifies the presence of FEAT_ETE.
return ((ArmReadIdAA64Dfr0 () & AARCH64_DFR0_TRACEVER) != 0);
}
+
+/** Checks if RME is implemented.
+
+ @retval TRUE RME is implemented.
+ @retval FALSE RME is not implemented.
+**/
+BOOLEAN
+EFIAPI
+ArmHasRme (
+ VOID
+ )
+{
+ return ((ArmReadIdAA64Pfr0 () & AARCH64_PFR0_RME) != 0);
+}
--
'Guid(CE165669-3EF3-493F-B85D-6190EE5B9759)'
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